Theorem pwsmnd

Description: The structure power of a monoid is a monoid. (Contributed by Mario Carneiro, 11-Jan-2015)

	Ref	Expression
Hypothesis	pwsmnd.y	⊢ 𝑌 = ( 𝑅 ↑s 𝐼 )
Assertion	pwsmnd	⊢ ( ( 𝑅 ∈ Mnd ∧ 𝐼 ∈ 𝑉 ) → 𝑌 ∈ Mnd )

Proof

Step	Hyp	Ref	Expression
1		pwsmnd.y	⊢ 𝑌 = ( 𝑅 ↑s 𝐼 )
2		eqid	⊢ ( Scalar ‘ 𝑅 ) = ( Scalar ‘ 𝑅 )
3	1 2	pwsval	⊢ ( ( 𝑅 ∈ Mnd ∧ 𝐼 ∈ 𝑉 ) → 𝑌 = ( ( Scalar ‘ 𝑅 ) Xs ( 𝐼 × { 𝑅 } ) ) )
4		eqid	⊢ ( ( Scalar ‘ 𝑅 ) Xs ( 𝐼 × { 𝑅 } ) ) = ( ( Scalar ‘ 𝑅 ) Xs ( 𝐼 × { 𝑅 } ) )
5		simpr	⊢ ( ( 𝑅 ∈ Mnd ∧ 𝐼 ∈ 𝑉 ) → 𝐼 ∈ 𝑉 )
6		fvexd	⊢ ( ( 𝑅 ∈ Mnd ∧ 𝐼 ∈ 𝑉 ) → ( Scalar ‘ 𝑅 ) ∈ V )
7		fconst6g	⊢ ( 𝑅 ∈ Mnd → ( 𝐼 × { 𝑅 } ) : 𝐼 ⟶ Mnd )
8	7	adantr	⊢ ( ( 𝑅 ∈ Mnd ∧ 𝐼 ∈ 𝑉 ) → ( 𝐼 × { 𝑅 } ) : 𝐼 ⟶ Mnd )
9	4 5 6 8	prdsmndd	⊢ ( ( 𝑅 ∈ Mnd ∧ 𝐼 ∈ 𝑉 ) → ( ( Scalar ‘ 𝑅 ) Xs ( 𝐼 × { 𝑅 } ) ) ∈ Mnd )
10	3 9	eqeltrd	⊢ ( ( 𝑅 ∈ Mnd ∧ 𝐼 ∈ 𝑉 ) → 𝑌 ∈ Mnd )